When an individual of the male gender is having his testicles orally gratified from the rear, said individual spreads the cheeks of their buttocks and thrusts themselves backwards, thus plunging the unfortunate recipient's nose into their gaping rectum; the rarity of the circumstances wherein a Dirty Pinnochio can be performed make this maneuver all the more impressive.

"Billy asked me to suck his balls from behind last night, and before I knew it, he gave me a Dirty Pinnochio."